Can tentative linoleum be applied over existing linoleum? ...

Dark blue or sunburn?
Answers:    No. My BIL does this kind of work for a living. You enjoy to take up the matured so you will have a floor to epoxy resin the new one down to. Glue will not stick to antiquated linoleum and if it isn't glued down it won't stay contained by place.
If i hire a decorator for the nursery...
only a week or two BEFORE the mart of the house closes...